package edu.ec.java02.group02.filters;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class SecurityFilter implements Filter {

	public void destroy() {
		// TODO Auto-generated method stub
	}

	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		
		
		HttpServletRequest  request=(HttpServletRequest) arg0;
		HttpServletResponse response=(HttpServletResponse) arg1;
		//arg2.doFilter(arg0, arg1);//默认放行
		
		if(request.getSession().getAttribute("login")!=null)
		{
			//开闸放行
			arg2.doFilter(arg0, arg1);
		}
		else
		{
			//堵住，转往错误页面
			request.getRequestDispatcher("../failed.jsp").forward(arg0, arg1);
		}

	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

}
